I hope you have removed all SDK. The order is:
1. All SDK's.
2. eVC4.
3. ActiveSync.
When you uninstalled eVC, you need to remove Platform Manager, Platform Builder.
And you need to install in the opposite order - from ActiveSync. You need to have enough space on the hard disk. And, as a user, you need to have access to the specific registry keys.
Here is a link to download:
http://www.microsoft.com/downloads/details.aspx?familyid=4a4ed1f4-91d3-4dbe-986e-a812984318e5&displaylang=enYou will find all installation instructions there too.
Installation issues listed here:
http://examples.oreilly.com/9780735618848/cd_contents/eVC4/readme.htm